Home / 5,091.40-7,638.64-2,131.28

Finding the Fourth Proportional to 5,091.40, 7,638.64 and 2,131.28

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Solution

The fourth proportional to 5,091.40, 7,638.64 and 2,131.28 is: 3,197.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,091.40 : 7,638.64 = 2,131.28 : x
  2. Step 2: Convert to fraction form
    5,091.40/7,638.64 = 2,131.28/x
  3. Step 3: Cross multiply
    5,091.40x = 7,638.64 × 2,131.28
  4. Step 4: Simplify right side
    5,091.40x = 16,280,080.66
  5. Step 5: Solve for x
    x = 16,280,080.66/5,091.40
  6. Step 6: Final answer
    x = 3,197.56

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.